Electric plug



H. ROCHAT ELECTRIC PLUG Jan. 26, 1932.

Filed June 18. 1930 2 Sheets-Sheet 1 f KJ fawn? I Jan. 26, 1932.

H. ROCHAT ELECTRIC PLUG Filed June 18, 1930 2 Sheets-Sheet 2 segment m91 Fig. 3 is a section. on line Patented Jan. 26,. 1932 mural)` sTAri-:s

HENRI MURAT, OF GENEVA, SWITZEBLAND morale rnujo .application medians 1s, 1930, smal a.

My invention relates to an electrical plug provided with voltage controlling means and with a test lamp.

In the annexed drawings:

Fig. 1 is a vertical section of my plug, the lamp being supposedly removed.

Fig. 2 is a horizontal section of the same, the lamp being supposed in lace.

-Xof Fig. 1.

Fig. 4 is a diagrammatic section on line Y-Y of Fig. 1, only the fixed parts being re resented.

ig. 5 is a similar sectional view, but only the movable parts being represented.

Fig. 6 isl an end view of the'plug.

Fig. 7 shows a. (glass plate adapted to be secured to the iixe parts.

Fig. 8 is a'diagram of the electrical connections.

Fig. 9 shows the resistor of the plug before its winding in place.

The plug is provided with two pins 1 and 2 which are adapted to cooperate with a twopin socket of any standard construction.

. The 'electric current enterin the plug through pin 1, for instance, is dlrected to a a member 3 which cooperates with a brush 4. The latter is connected with a terminal 4h cooperating with another brush'4 to which is connected awire 5 which leads to the socket 6 of the test lamp 7. This lamp is in turn connected to the external circuit 8, 9 from which the current is directed to the third brush 10 contacting with a terminal 10", itself connected with a brush 10 cooperv ating with a segmental member 11 connected 'current passes direct with the .second pin 2.

A resistance 12 is connected in shunt with lamp?.

In the position represented in Fig. 8, the y from the supply' line to the external circuit the resistance o 12 and 7 being negligible. When the movable part 13 is rotated'clockwise for one twelfth of a turn (with respect to the iixed part 14), two portions 15 and 16 of a resistance are inserted 1n series in the circuit. By rotating part 13 for another twelfth of a.` turn, the inserted resistance is increased, and so on up to a maximum for. a rotation of 150, when the' 462,078, and in Switzerland July 1, 1989.

portions 15, 17, 19, 21, 23 and 16, 18, 20, 22, 24 are all inserted.`

The resistance is formed by metallic wires wound on a mica support 25 as shown in Fig. 9 before its rolling in place. The lengths w55 and b correspond to 150 -when the resistance is in place on its insulating support 13. The latter is provided with studs 27 which are used to secure the mica plate 25 as shown in Fi 3. A box or cover 29 is fixed to part 13 0 an rotatable with it and the resistance con-l trol isobtained by rotating box 29.

A ush-button 30 with spring 31 is provide in the fixed part 14. A lateral finger 33 is fixed on this button, thisfinger coop- 55 erating with de ressions 34 in the movable part 13 to lock t e latter at its successive correct positions.

The periphery of box 29 is milled at 36 to make its hand-control easier. A glass plate ,70, 37 is fixed to the ixed part 14 and is provided with voltage indications coo erating with openings 38, 39 in the bottom o the box. AThe rotation of the latter is limited to 150 because the slit 40 in which depressions 34 are provided, is itself limited to 150.

When the indication 110 for instance, is in front of opening 38, no indication can be seen through opening 39. When box 29 is rotated clockwise for 30, the indication 125 is seen through 39, no indication being in front of 38, and so on. l

Ventilating holes 41 and 42 are provided.

The device is used to allow the connection of an apparatus on different supply lines. When dealing, for instance, with an electric iron for hair-waving or other purposes, constructed for 110 volts, the latter may be used with lines at 125, 145, 190, 220 and 250 volts by rotating box29 conveniently, the voltage read on plate 37 being the voltage of the line. But the device is also useful to permit of controlling the current during use when needed.

I claim:

l. An electric plug comprising a lixed body having a cylindrical portion an means to be connected with the supply line; two seg-` mental-members on said portion each being connected with a pole of the supply line; a rotatable annular member loose on said cylinals drical ortion; an annular resistance supported liy said annular member, said resistance being divided into two halves insulated from each other; a air of brushes carried 5 by said annular mem er, adapted to cooperate with said segment/member and connected each with one end of one half of said annular` v resistance, and said brushes being arranged at 180 fromeach other; a succession of ter- 10 minals concentrically disposed on said annu.- lar member and lconnected With different points of said resistance in spaced and reguar relation a pair of brushes carried by said `body and adapted to cooperate with said ter- 15 minals said brushes bein disposed 180 apart irom each other; an .an external circuit connected in series with said brushes.

, 2. A plug as )claimed in claim 1, wherein the rotation of the movable annular mem- 20 ber is limited by a push-button locking device carried by the fixed body.

In testimony thereof, I ax my si ature.

HENRI ROC T. 

